DEWA 1513403-R0 22kV 11kV XLPE Cables (2).pdf

PART VI ( SPECIFICATION ) 22/11 KV XLPE CABLES 22/11 KV XLPE CABLES 22&11kV XLPE Cables LIST OF CONTENTS FOR TECHNICAL SPECIFICATIONS FOR 22/11 KV XLPE CABLES INDEX SECTION TITLE 1. SCOPE 2. 2.1 2.2 APPLICABLE STANDARDS International Standards Internal Standards 3. 3.1. 3.2. 3.3. 3.4. 3.5. 3.6. 3.7. 3.8. 3.9. 3.10. 3.11. 3.12. 3.13. 3.14. DESIGN AND CONSTRUCTION Conductors Conductor Screen Insulation Insulation Non-metallic Screen Insulation Metallic Screen Water
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    22/11 KV XLPE CABLES PART VI (   S PECIFICATION ) 22/11 KV XLPE CABLES  22&11kV XLPE Cables Dubai Electricity & Water Authority 1 of 10 All Rights are reserved LIST OF CONTENTS FOR TECHNICAL SPECIFICATIONS FOR 22/11 KV XLPE CABLES INDEX   SECTION   TITLE   1. SCOPE 2. APPLICABLE STANDARDS 2.1 International Standards 2.2 Internal Standards 3. DESIGN AND CONSTRUCTION 3.1. Conductors 3.2. Conductor Screen 3.3. Insulation 3.4. Insulation Non-metallic Screen 3.5. Insulation Metallic Screen 3.6. Water Sealing 3.7. Armour Bonding 3.8. Armour 3.9. Over sheath 3.10. Extrusion 3.11. Core Identification 3.12. Laying-up 3.13. Embossing 3.14. Overall Dimensions 4. COMPONENTS AND ACCESSORIES 5. OPERATIONAL REQUIREMENTS 6. MAINTENANCE REQUIREMENTS 7. TYPE, ROUTINE AND FACTORY ACCEPTANCE TESTS 7.1. Type Tests 7.2. Routine Tests 7.3. Factory Acceptance Tests 7.4 Physical inspection of cable, drum and packing 8. COMMISSIONING REQUIREMENTS AND TESTS 8.5. Tests After Laying 9. TOOLS AND ACCESSORIES 9.1. Cable length 9.2. Sealing and Drumming 10. RATING AND DATA SHEET 10.1. Data Sheet for 11kV Cables 10.2 System 10.3 Design Criteria 10.4 Type of Cables 10.5 Construction 10.6 Data Sheet for 22kV Cables  22&11kV XLPE Cables Dubai Electricity & Water Authority 2 of 10 All Rights are reserved 1.   SCOPE Para (1)   This section details technical specification of XLPE insulated power cables for nominal system voltage of 11 and 22 kV. 2.   APPLICABLE STANDARDS 2.1 International Standards Para (2)   Except where modified by this specification, cable shall be designed, manufactured, and tested in accordance with the latest edition of IEC 60502-2 publication including amendments and other publications quoted in these Standards. IEC 60060 High Voltage Test Techniques - Part I: General Definitions and Test Requirements. IEC 60183 Guide to the selection of high voltage cables. IEC 60228 Conductors of insulated Cables IEC 60230 Impulse Tests on Cables and their Accessories. IEC 60502-2 Power Cables with extruded insulation and their accessories for rated voltages from 1kV (Um = 1.2 kV) upto 30 kV (Um = 36 kV) -Part 2: Cables for rated voltages from 6kV (Um = 7.2 kV) upto 30 kV (Um = 36 kV). IEC 60502-4 Power Cables with extruded insulation and their accessories for rated voltages from 1kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV) -Part 4: Test requirements on accessories for cables with rated voltages from 6 kV (Um = 7.2 kV) up to 30 kV (Um = 36 kV) IEC 60811 Common test methods for insulating and sheathing materials for electric cables. IEC 60885 Electrical test methods for electric cables. IEC 60986 Guide to the short circuit temperature limits of electric cables with a rated voltage from 1.8/3 (3.6) kV to 18/30 (36) kV. IEC 60287 Electric Cables - Calculation of the current rating 2.2 Internal Standards ã   Site and system operating conditions as per Design Criteria ã   General Technical Requirements for equipment as per ã   General quality assurance requirements for Equipments as per ã   Quality management system as per ISO 9001 3.   DESIGN AND CONSTRUCTION Para (3)   This specification covers the following types of cables: ã   Single core unarmored cables ã   Three Core armored cables. Para (4)   Water protection cover over individual core.  22&11kV XLPE Cables Dubai Electricity & Water Authority 3 of 10 All Rights are reserved Para (5)   Easy to remove water barrier tubes / semi-conducting / insulation by special tools Para (6)   Design and construction data for each type of cable is given in 'Data Schedule for Cables in Enclosure-1. Para (7)   Three core cable with circular, stranded copper/  aluminium  conductors with triple extruded conductor screen, insulation and insulation screen of which conductor and insulation screen are of semi-conducting materials and insulation is of dry vulcanized cross linked  polyethylene, all the individual cores laid up with non-hygroscopic Fillers, individual metallic screens of copper tape and/or wires, armored with a single layer of galvanized steel wires and PVC/PE sheathed overall suitable for   6.35/11 (12) and 12.7/22(24) KV working voltage manufactured generally in accordance with IEC Publication 60502. Para (8)   Water sealing of conductors and longitudinal and radial water sealing along the metallic screen is applied. Para (9)   The following conductor sizes are covered by this specification: - ã   Type-1:, Copper ã   Type-2:, Aluminium ã   Type-3:, Copper ã   Type-4:, Aluminium 3.1.   Conductors Para (10)   The conductors shall be stranded compacted circular construction. Conductor material shall be annealed copper or aluminium   with cross section as specified in Specific Requirements and shall conform to class 2 of IEC 60228 Specifications. The wire before shaping shall be smooth, uniform in quality, free from scale, inequalities, spills, splits and other defects. 3.2.   Conductor Screen Para (11)   The conductor screen shall consist of an extruded semi-conducting compound. The screen shall fill the interstices between the outer individual strand wires forming the conductor and provide a smooth, regular interface to the insulation layer. The extruded semi-conducting compound shall be firmly bonded to the insulation. 3.3.   Insulation Para (12)   Insulation shall be extruded cross-linked polyethylene (XLPE), which shall be applied using a dry cure process designed to eliminate micro voids in the insulation. Para (13)   The tenderer shall furnish separately material properties of XLPE as listed below: ã   Physical properties ã   Electrical properties ã   Aging properties ã   Anti hygroscopic properties ã   Heat distortion properties ã   Certificates of srcin from Raw Material Manufacturers Para (14)   The average thickness of the insulation, when determined by the method described in IEC 60811 shall not be less than the value stated in IEC 60502-2. The thickness at any  place may, however, be less than the specified nominal value provided that the difference does not exceed the limit specified in IEC 60502-2. The thickness of the semi-conducting screen on the conductor or over the insulation shall not be included in the thickness of the insulation.


Jul 23, 2017
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